igb(4) Raising IGB_MAX_RXD ??

[Jack Vogel]

On Thu, Apr 19, 2012 at 12:26 PM, Sean Bruno <seanbru at yahoo-inc.com> wrote:

> On Thu, 2012-04-19 at 07:09 -0700, Jack Vogel wrote:
> > OH, well that's interesting to know, thanks John.
> >
> > Jack
> >
>
>
> Front end box looks pretty happy today at 8k descriptors.
>
> http://people.freebsd.org/~sbruno/igb_8k_stats.txt
>
> Under peak, we're approaching 20MBytes/sec in and out of the
> interface.  :-)  Nifty.
>
> -bash-4.2$ netstat 1
>            input        (Total)           output
>   packets  errs idrops      bytes    packets  errs      bytes colls
>     59542     0     0   18189602      59131     0   19884085     0
>     58941     0     0   18036651      58673     0   19702671     0
>     58790     0     0   18069235      58422     0   19897858     0
>     58226     0     0   17948175      57969     0   19648810     0
>     58689     0     0   18167855      58479     0   19909843     0
>     58633     0     0   17952951      58437     0   19760197     0
>     61019     0     0   18779030      60592     0   20394481     0
>     56696     0     0   17647407      56552     0   19261155     0
>     58853     0     0   18186019      58530     0   19886197     0
>     58739     0     0   18314790      58768     0   20165654     0
>     58748     0     0   18267243      58539     0   20016668     0
>     58672     0     0   17914657      58378     0   19558833     0
>     59885     0     0   18332641      59780     0   20239241     0
>
>
> We're going to crank one server up to 8 igb queues and
> hw.igb.max_rxd/txd to 32k and see what blows up.
>
> Sean
>
>
>
Great, look forward to the results. Thanks Sean.

Jack